南海北部冬、夏季海表浮游植物光合作用速率对光强的响应特征

郝锵; 刘诚刚; 乐凤凤; 彭欣; 曾祥茜; 蔡昱明

doi:10.3969/j.issn.0253-4193.2016.04.002

南海北部冬、夏季海表浮游植物光合作用速率对光强的响应特征

doi: 10.3969/j.issn.0253-4193.2016.04.002

1.
卫星海洋环境动力学国家重点实验室, 浙江杭州 310012;国家海洋局第二海洋研究所, 浙江杭州 310012
2.
国家海洋局第二海洋研究所, 浙江杭州 310012;国家海洋局海洋生态系统与生物地球化学重点实验室, 浙江杭州 310012
3.
浙江省海洋水产养殖研究所, 浙江温州 325005
4.
卫星海洋环境动力学国家重点实验室, 浙江杭州 310012;天津农学院水产学院, 天津 300384

基金项目: 国家自然科学基金(91128212,90711006);全球变化和海气相互作用专项(GASI03-01-03-02,GASI-03-01-03-03);国家海洋局第二海洋研究所基本科研业务专项资金项目(JG1310)。

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出版历程
- 收稿日期: 2015-09-16
- 修回日期: 2015-11-20

Phytoplankton photosynthesis-irradiance parameters during summer and winter in the northern South China Sea

1.
State Key Laboratory of Satellite Ocean Environment Dynamics, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
2.
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Key Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou 310012, China
3.
Zhejiang Marine Aquaculture Research institute, Wenzhou 325005, China
4.
State Key Laboratory of Satellite Ocean Environment Dynamics, Hangzhou 310012, China;Department of Fishery Science, Tianjin Agricultural University, Tianjin 300384, China

摘要

摘要: 本文通过南海北部冬、夏季航次的现场观测,研究了海表浮游植物光合作用速率对光强的响应特征(P-E曲线)。结果表明南海北部浮游植物P-E曲线存在明显的季节变化。在冬季,P-E曲线呈现高P_m^B、高α、高β的特征,这表明冬季浮游植物在低光照环境中光合作用速率增加迅速,其最大光合作用速率较高但容易受到光抑制。与冬季相反,夏季P-E曲线呈现低P_m^B、低α、低β的特征,浮游植物受光抑制影响小,但最大光合作用速率低于冬季。水温和粒级结构等指标与P-E参数存在显著相关,这意味着环境和群落的季节变化可能对光合作用特性有一定影响。通过P-E参数模拟得到真光层内光合作用速率,模拟值与现场结果之间呈明显的线性相关但存在高估。此研究有助于认识南海浮游植物光合作用特征,并为初级生产力模型研究提供依据。
- 光合作用 /
- P-E曲线 /
- 南海北部 /
- 浮游植物
Abstract: The phytoplankton photosynthesis rate is important to understand the variations of oceanic primary production (PP). In this study,we measured sea surface photosynthesis-irradiance (P-E) parameters from in situ experiments during summer and winter cruises,which was carried out in the northern South China Sea (nSCS) in 2004. The results showed that the P-E parameters had obvious seasonal variations in the nSCS. In winter,the P-E parameters were characterized by high α,high β,and high P_m^B. It indicated that phytoplankton could achieve relatively higher maximum photosynthesis rate,but the light-inhabitation would be significant when the light was supersaturate. In contrast to winter,the P-E parameters,α,β,and P_m^B, were relatively lower in summer,which indicated that phytoplankton favorites high photosynthetically active radiation environment,and its maximum photosynthesis rate was lower than that in winter but the light-inhabitation was very slight. We found some factors,such as temperature and size structure of phytoplankton,have significant correlation with P-E parameters. This implied that the photosynthesis rate was affected by both the seasonal changes of environment and the phytoplankton groups. The photosynthesis rate (P_model^B),calculated by P-E parameters,had significant linear correlation with the in situ photosynthesis rate (P_{in situ}^B) which was derived by PP experiments. However,the P_model^B results also showed overestimation,which was mainly due to the fact that the respiration rate could not be neglected in the P-E experiment. The results are helpful in the understanding of the characters of phytoplankton photosynthesis in the nSCS.
- photosynthesis /
- northern South China Sea /
- photosynthesis-irradiance curve /
- phytoplankton

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